util/dnsname: use vizerror for all errors

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The errors emitted by util/dnsname are all written at least moderately
friendly and none of them emit sensitive information. They should be
safe to display to end users.

Updates tailscale/corp#9025

Change-Id: Ic58705075bacf42f56378127532c5f28ff6bfc89
Signed-off-by: Adrian Dewhurst <adrian@tailscale.com>

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